I'm not sure specifically as there could be many different versions of 'dream a little dream fanfiction'. But typically, it might include the main characters from the original work on which the fanfiction is based. For example, if it's based on a book series, the protagonist and antagonist from that series would likely be main characters in the fanfiction as well.
It really depends on the plot of the fanfiction. However, if it's a fanfiction about a particular movie, the lead actor's character would probably be one of the main characters. And if there are any original characters created by the fanfiction writer, they could also become main characters if their storylines are central to the overall plot of 'dream a little dream fanfiction'.
A practical answer is Chapter 22, because it turns the idea into a concrete scene. The chapter opens with Hearing this, Su Yinwan looked at Shang Shaojing with a face full of..., adds pressure through Why are you yelling so loudly?, and ends on Jiang Li's righteousness temporarily shut Jiang Yan.
Chapter 840, "How did you meet Miss Jiang?", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event.
Chapter 886, "Stinky Beggar", is the clearest early answer because it turns Capital's situation into a concrete plot event. The chapter turns that into something concrete by moving from After speaking, Jiang Li stepped forward and said, "I'll treat this...
Look to Chapter 37 for the clearest answer. It begins with The barrage was suddenly filled with hahas, but the two guests present..., keeps building through He Yun spent most of her time filming movies, had no interest in variety..., and lands on I look forward to your guidance." He Yun nodded.
Chapter 854, "These Brothers Are Quite Lacking in Love", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter turns that into something concrete by moving from If this bracelet gets bumped anywhere, she'll be heartbroken, right?
Look to Chapter 16 for the clearest answer. It begins with Just as the words fell, Jiang Shixu swiftly cast his eyes downward., keeps building through His eyelashes were very long;
Chapter 858, "If You Dare, Take It", is the clearest early answer because it turns Weibo's situation into a concrete plot event. It opens with Changqing flicked his horsetail whisk, face wooden, and said,... and closes on When is it going to be completed so I can visit?] [Whoa, it's....
A practical answer is Chapter 8, because it turns the idea into a concrete scene. The chapter opens with The resentment that had barely calmed among the crowd surged back two..., adds pressure through Why keep harping on the fact that he wasn't a decent man?, and ends on Other people with a.
A practical answer is Chapter 4, because it turns the idea into a concrete scene. The chapter opens with Qiao regretted her words as soon as they left her mouth., adds pressure through It's difficult for us when you ask for a guest's room number and key right..., and ends on A little girl acting.